Hi, struggling to grasp how the chart convergency is calculated to be 4 degrees from the Lambert's Calculation question at the end of the conic projections lesson (I have attempted to put a screenshot below, but not overly confident the format will work).

I cannot see how the convergency equation is being utilised- help needed!

Thx!

I cannot see how the convergency equation is being utilised- help needed!

Thx!

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